The Merlin CT1250 acts as an interlock between the ventilation system and the gas solenoid valve. The system has built in current monitors in order to interlock with up to 2 fans and offers an alternative to using air pressure differential switches.
 
The Merlin CT1250 ventilation interlock system, with built in current monitoring, is designed specifically for use in commercial kitchens to meet BS6173. This panel is to be used when the kitchen appliances do have flame failure devices, therefore Gas proving is not a requirement.
 
Features.
 
Ventilation interlock system which isolates the fuel supply if the ventilation fails
Monitor up to 2 extract or supply fans
Internal fan current monitors 
Gas Isolation
 
For more infomation on the regulations